Even if it was counterfeit, which I highly doubt, if it had the weight and the look, I'd use it.

Heck, I sold KonAaronSnake a counterfeit Record Titanium seatpost, and neither he nor I knew it.
We still don't.

If I needed one, I'd buy it from you, if you took $3.50 off, because that's my fee to maybe be fooled by the Doc.

Really, that is one silly buyer. His loss.
He could have owned a part used by A Legend, a Dairyland Dare Vintage Class Enthusiast winner.